Penguins are birds that are adapted for living near water. penguins have both structural and behavioral adaptation that make them successful in water. which is a structural Adaptation of a penguin A. having oily fur
b. selecting a mate for life
c. living in a large community
d. swallowing a stone before diving

the answer is c) abandoned properties that are contaminated with hazardous materials.

answer : haversian

[explanation: -(compact bone is organized as parallel columns, known as haversian systems, which run lengthwise down the axis of long bones. these columns are composed of lamellae, concentric rings of bone, surrounding a central channel, or haversian canal, that contains the nerves, blood vessels, and lymphatic system of the bone)]

the law of original horizontality explains:   why rocks appear in layers. correct answer: b the law suggests that all rock layers are originally laid down (deposited) horizontally and can later be deformed.   the principle is used by geologists to make assumptions about the relative ages of sedimentary rocks.